Global Chaucers is a far ranging collaborative project
NetSERF: The Internet Connection for Medieval Resources is large and growing.
Reti Medievali Even broader and international in coverage.
Guide to Byzantine Studies at Dumbarton Oaks.
Guide to Digital Renaissance Studies from Harvard University, including Villa I Tatti.
Online Medieval Sources Bibliography
Signets de la Bibliotheque: A French list of medieval sources from the Bibliotheque Nationale, Paris
Labyrinth Project - A revision of one of the oldest medieval metasites.